/*
 * Copyright 1999-2017 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package studio.raptor.sqlparser.ast.statement;

import studio.raptor.sqlparser.ast.SQLObjectImpl;
import studio.raptor.sqlparser.ast.SQLOrderBy;
import studio.raptor.sqlparser.visitor.SQLASTVisitor;

public class SQLUnionQuery extends SQLObjectImpl implements SQLSelectQuery {

  private SQLSelectQuery left;
  private SQLSelectQuery right;
  private SQLUnionOperator operator = SQLUnionOperator.UNION;
  private SQLOrderBy orderBy;

  public SQLUnionQuery() {

  }

  public SQLUnionOperator getOperator() {
    return operator;
  }

  public void setOperator(SQLUnionOperator operator) {
    this.operator = operator;
  }

  public SQLSelectQuery getLeft() {
    return left;
  }

  public void setLeft(SQLSelectQuery left) {
    if (left != null) {
      left.setParent(this);
    }
    this.left = left;
  }

  public SQLSelectQuery getRight() {
    return right;
  }

  public void setRight(SQLSelectQuery right) {
    if (right != null) {
      right.setParent(this);
    }
    this.right = right;
  }

  public SQLOrderBy getOrderBy() {
    return orderBy;
  }

  public void setOrderBy(SQLOrderBy orderBy) {
    if (orderBy != null) {
      orderBy.setParent(this);
    }
    this.orderBy = orderBy;
  }

  @Override
  protected void accept0(SQLASTVisitor visitor) {
    if (visitor.visit(this)) {
      acceptChild(visitor, left);
      acceptChild(visitor, right);
      acceptChild(visitor, orderBy);
    }
    visitor.endVisit(this);
  }

}
